The Air Force is today set to test the unmanned Boeing (BA) X-51 WaveRider "scramjet," which can...

The Air Force is today set to test the unmanned Boeing (BA) X-51 WaveRider "scramjet," which can reach a ridiculous 4,000 miles per hour. The idea of the trial is to sustain hypersonic flight for up to five minutes, double the previous record, and take the developers another step further to revolutionizing air travel. Also involved in the project is United Tech's (UTX) Pratt & Whitney.